In the icy near-vacuum of interstellar space are seething
... And yet these tiny grains—of uncertain composition, though graphite, silicon, carbide, and iron are possible constituents—contribute less than one percent to a cloud's total mass. Their effect becomes appreciable only because of the great size of the clouds—some of them up to 100 light-years across. ...
... And yet these tiny grains—of uncertain composition, though graphite, silicon, carbide, and iron are possible constituents—contribute less than one percent to a cloud's total mass. Their effect becomes appreciable only because of the great size of the clouds—some of them up to 100 light-years across. ...
AGN-Hubble
... You must use nearby galaxies to calibrate distance indicators that can be seen across the Universe. 1) brightest star (hypergiants), then HII region (star form.) 2) largest spiral in cluster 3) brightest galaxy in cluster “Tully-Fisher” relation: Luminosity in red or infrared correlated with 21-cm b ...
... You must use nearby galaxies to calibrate distance indicators that can be seen across the Universe. 1) brightest star (hypergiants), then HII region (star form.) 2) largest spiral in cluster 3) brightest galaxy in cluster “Tully-Fisher” relation: Luminosity in red or infrared correlated with 21-cm b ...
14-1 Reading Questions: Neutron Stars
... 1. A neutron star, containing a little more than _________ solar mass, compressed to a radius of about __________, can be left as a remnant after a type ______ supernova explosion. A neutron star’s density is so high that physicists calculate that this material is stable only as a __________________ ...
... 1. A neutron star, containing a little more than _________ solar mass, compressed to a radius of about __________, can be left as a remnant after a type ______ supernova explosion. A neutron star’s density is so high that physicists calculate that this material is stable only as a __________________ ...
What is a star?
... What is a star? • Stars have different sizes, ranging from 1/100 the size of the sun to 1,000 times the size of the sun. • Two or more stars may be bound together by gravity, which causes them to orbit each other. • Three or more stars that are bound by gravity are called multiple stars or multiple ...
... What is a star? • Stars have different sizes, ranging from 1/100 the size of the sun to 1,000 times the size of the sun. • Two or more stars may be bound together by gravity, which causes them to orbit each other. • Three or more stars that are bound by gravity are called multiple stars or multiple ...
Astronomy 101 Course Review and Summary
... Aristotle (4th cent BC) showed that the Earth is round. Greek astronomers developed a geocentric model for the universe. Ptolemy (2nd cent) used epicycles to explain retrograde motion of planers. Copernicus (16th cent) proposed a heliocentric model for the universe. In the model of Copernicus, retro ...
... Aristotle (4th cent BC) showed that the Earth is round. Greek astronomers developed a geocentric model for the universe. Ptolemy (2nd cent) used epicycles to explain retrograde motion of planers. Copernicus (16th cent) proposed a heliocentric model for the universe. In the model of Copernicus, retro ...
final fate of a massive star
... A tremendous creation and destruction of particles will take place in its vicinity. One could imagine it as the `cosmic dance' of basic forces of nature, which may come together in a unified manner. This is because the energies and all physical quantities reach their extreme values in the vicinity ...
... A tremendous creation and destruction of particles will take place in its vicinity. One could imagine it as the `cosmic dance' of basic forces of nature, which may come together in a unified manner. This is because the energies and all physical quantities reach their extreme values in the vicinity ...
Astr604-Ch1
... (b) it radiates energy supplied by an internal source. From the first condition it follows that the shape of such a body must be a spherical, for gravity is a spherical symmetric force field. Or, it might be spheroidal, if axisymmetric forces are also present. The source of radiation is usually nucl ...
... (b) it radiates energy supplied by an internal source. From the first condition it follows that the shape of such a body must be a spherical, for gravity is a spherical symmetric force field. Or, it might be spheroidal, if axisymmetric forces are also present. The source of radiation is usually nucl ...
Astronomical Distance Determination • etc.
... two times to about 2.3 million light years. Results from the Hipparcos satellite have given a larger distance near 2.5 million light years to the Andromeda Galaxy ...
... two times to about 2.3 million light years. Results from the Hipparcos satellite have given a larger distance near 2.5 million light years to the Andromeda Galaxy ...
Chapter 15 Surveying the Stars
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
Part II: Ideas in Conflict.
... luminous its redshift indicates it is 4 billion light years away!! ...
... luminous its redshift indicates it is 4 billion light years away!! ...
Section 4 Formation of the Universe Chapter 19
... • Stars can be classified by their size, mass, brightness, color, temperature, spectrum, and age. A star’s classification can change as it ages. • Main-Sequence Stars After a star forms, it enters the second and longest stage of its life cycle known as the main sequence. Energy is generated in the ...
... • Stars can be classified by their size, mass, brightness, color, temperature, spectrum, and age. A star’s classification can change as it ages. • Main-Sequence Stars After a star forms, it enters the second and longest stage of its life cycle known as the main sequence. Energy is generated in the ...
luminosity1
... of a star. (Along with color and Wien’s Law) • Spectral typing can also be used to find out how much of a given element is in a star. • HD 161817 has much less of all the elements, other than Hydrogen and Helium, than the Sun. • In fact, it has about 0.03 the value of the Sun for all 90 elements. Th ...
... of a star. (Along with color and Wien’s Law) • Spectral typing can also be used to find out how much of a given element is in a star. • HD 161817 has much less of all the elements, other than Hydrogen and Helium, than the Sun. • In fact, it has about 0.03 the value of the Sun for all 90 elements. Th ...
Sky Science
... S-6 The Spinning Earth #2 Constellations and Stars Constellations are imaginary pictures that are suggested by star locations. As the Earth rotates on its axis, that star and constellations appear to move around in a large circle at night. In the northern hemisphere where we are, the constellations ...
... S-6 The Spinning Earth #2 Constellations and Stars Constellations are imaginary pictures that are suggested by star locations. As the Earth rotates on its axis, that star and constellations appear to move around in a large circle at night. In the northern hemisphere where we are, the constellations ...
A little bit more to do. Stefan
... of a star. (Along with color and Wien’s Law) • Spectral typing can also be used to find out how much of a given element is in a star. • HD 161817 has much less of all the elements, other than Hydrogen and Helium, than the Sun. • In fact, it has about 0.03 the value of the Sun for all 90 elements. Th ...
... of a star. (Along with color and Wien’s Law) • Spectral typing can also be used to find out how much of a given element is in a star. • HD 161817 has much less of all the elements, other than Hydrogen and Helium, than the Sun. • In fact, it has about 0.03 the value of the Sun for all 90 elements. Th ...
Sirius Astronomer - Orange County Astronomers
... dispute over what happened to the water that apparently was plentiful on Mars billions of years ago. Sinking into the ground may be one answer. Minerals least likely to dissolve in water, such as silica, hematite and gypsum, were found nearer the surface, while minerals of increasing solubility, su ...
... dispute over what happened to the water that apparently was plentiful on Mars billions of years ago. Sinking into the ground may be one answer. Minerals least likely to dissolve in water, such as silica, hematite and gypsum, were found nearer the surface, while minerals of increasing solubility, su ...
LIFE CYCLE OF STARS
... A Star’s Old Age to Death Medium Stars Cool at the end of the Red Giant stage faster than larger stars, so they begin to shed its gases outside its core forming a planetary nebula . The center of the small star then begins to cool to become a white dwarf and cools more to become a black dwarf. ...
... A Star’s Old Age to Death Medium Stars Cool at the end of the Red Giant stage faster than larger stars, so they begin to shed its gases outside its core forming a planetary nebula . The center of the small star then begins to cool to become a white dwarf and cools more to become a black dwarf. ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.